EP3211944A2 - Verfahren zum senden und empfangen eines signals von vorrichtung zu vorrichtung in einem drahtloskommunikationssystem und vorrichtung dafür - Google Patents

Verfahren zum senden und empfangen eines signals von vorrichtung zu vorrichtung in einem drahtloskommunikationssystem und vorrichtung dafür Download PDF

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Publication number
EP3211944A2
EP3211944A2 EP15852215.1A EP15852215A EP3211944A2 EP 3211944 A2 EP3211944 A2 EP 3211944A2 EP 15852215 A EP15852215 A EP 15852215A EP 3211944 A2 EP3211944 A2 EP 3211944A2
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Prior art keywords
d2dss
transmission
subframe
resource
discovery
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Granted
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EP15852215.1A
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English (en)
French (fr)
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EP3211944A4 (de
EP3211944B1 (de
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Seungmin Lee
Hanbyul Seo
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LG Electronics Inc
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LG Electronics Inc
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Publication of EP3211944A4 publication Critical patent/EP3211944A4/de
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/70—Services for machine-to-machine communication [M2M] or machine type communication [MTC]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/005—Discovery of network devices, e.g. terminals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/001—Synchronization between nodes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/12—WLAN [Wireless Local Area Networks]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/18—Interfaces between hierarchically similar devices between terminal devices

Definitions

  • the present invention relates to a wireless communication system and, more specifically, to a method for transmitting and receiving a D2D signal in a wireless communication system and an apparatus therefor.
  • a 3rd generation partnership project long term evolution (3GPP LTE) (hereinafter, referred to as 'LTE') communication system which is an example of a wireless communication system to which the present invention can be applied will be described in brief.
  • 3GPP LTE 3rd generation partnership project long term evolution
  • FIG. 1 is a diagram illustrating a network structure of an Evolved Universal Mobile Telecommunications System (E-UMTS) which is an example of a wireless communication system.
  • E-UMTS Evolved Universal Mobile Telecommunications System
  • 3GPP 3rd Generation Partnership Project
  • the E-UMTS may be referred to as a Long Term Evolution (LTE) system. Details of the technical specifications of the UMTS and E-UMTS may be understood with reference to Release 7 and Release 8 of "3rd Generation Partnership Project; Technical Specification Group Radio Access Network".
  • the E-UMTS includes a User Equipment (UE), base stations (eNode B; eNB), and an Access Gateway (AG) which is located at an end of a network (E-UTRAN) and connected to an external network.
  • the base stations may simultaneously transmit multiple data streams for a broadcast service, a multicast service and/or a unicast service.
  • One cell is set to one of bandwidths of 1.44, 3, 5, 10, 15 and 20MHz to provide a downlink or uplink transport service to several user equipments. Different cells may be set to provide different bandwidths.
  • one base station controls data transmission and reception for a plurality of user equipments. The base station transmits downlink (DL) scheduling information of downlink data to the corresponding user equipment to notify the corresponding user equipment of time and frequency domains to which data will be transmitted and information related to encoding, data size, and hybrid automatic repeat and request (HARQ).
  • DL downlink
  • HARQ hybrid automatic repeat and request
  • the base station transmits uplink (UL) scheduling information of uplink data to the corresponding user equipment to notify the corresponding user equipment of time and frequency domains that can be used by the corresponding user equipment, and information related to encoding, data size, and HARQ.
  • UL uplink
  • An interface for transmitting user traffic or control traffic may be used between the base stations.
  • a Core Network (CN) may include the AG and a network node or the like for user registration of the user equipment.
  • the AG manages mobility of the user equipment on a Tracking Area (TA) basis, wherein one TA includes a plurality of cells.
  • TA Tracking Area
  • An object of the present invention devised to solve the problem lies in a method for transmitting and receiving a D2D signal in a wireless communication system and an apparatus therefor.
  • a method of transmitting a D2DSS (Device-to-Device Synchronization Signal) by a first UE (User Equipment) in a wireless communication system includes: determining a D2DSS transmission-related intention of the first UE; and transmitting the D2DSS to a second UE when the first UE has the D2DSS transmission-related intention, wherein the D2DSS is transmitted prior to a first scheduling assignment period when the first UE has the D2DSS transmission-related intention.
  • PSBCH DMRS Physical Sidelink Broadcast Channel Demodulation Reference Signal
  • the D2DSS may be transmitted within a predetermined range prior to the first scheduling assignment period.
  • a first UE transmitting a D2DSS in a wireless communication system includes: a radio frequency (RF) unit; and a processor, wherein the processor is configured to determine a D2DSS transmission-related intention of the first UE and to transmit the D2DSS to a second UE when the first UE has the D2DSS transmission-related intention, wherein the D2DSS is transmitted prior to a first scheduling assignment period when the first UE has the D2DSS transmission-related intention.
  • RF radio frequency
  • transmission and reception of D2D signals can be efficiently performed in a wireless communication system.
  • the following technology may be used for various wireless access technologies such as CDMA (code division multiple access), FDMA (frequency division multiple access), TDMA (time division multiple access), OFDMA (orthogonal frequency division multiple access), and SC-FDMA (single carrier frequency division multiple access).
  • the CDMA may be implemented by the radio technology such as UTRA (universal terrestrial radio access) or CDMA2000.
  • the TDMA may be implemented by the radio technology such as global system for mobile communications (GSM)/general packet radio service (GPRS)/enhanced data rates for GSM evolution (EDGE).
  • GSM global system for mobile communications
  • GPRS general packet radio service
  • EDGE enhanced data rates for GSM evolution
  • the OFDMA may be implemented by the radio technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, and evolved UTRA (E-UTRA).
  • the UTRA is a part of a universal mobile telecommunications system (UMTS).
  • UMTS universal mobile telecommunications system
  • 3GPP LTE 3rd generation partnership project long term evolution
  • E-UMTS evolved UMTS
  • LTE-advanced LTE-advanced
  • FIG. 2 is a diagram illustrating structures of a control plane and a user plane of a radio interface protocol between a user equipment and E-UTRAN based on the 3GPP radio access network standard.
  • the control plane means a passageway where control messages are transmitted, wherein the control messages are used by the user equipment and the network to manage call.
  • the user plane means a passageway where data generated in an application layer, for example, voice data or Internet packet data are transmitted.
  • a physical layer as the first layer provides an information transfer service to an upper layer using a physical channel.
  • the physical layer is connected to a medium access control (MAC) layer via a transport channel, wherein the medium access control layer is located above the physical layer.
  • Data are transferred between the medium access control layer and the physical layer via the transport channel.
  • Data are transferred between one physical layer of a transmitting side and the other physical layer of a receiving side via the physical channel.
  • the physical channel uses time and frequency as radio resources.
  • the physical channel is modulated in accordance with an orthogonal frequency division multiple access (OFDMA) scheme in a downlink, and is modulated in accordance with a single carrier frequency division multiple access (SC-FDMA) scheme in an uplink.
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single carrier frequency division multiple access
  • a medium access control (MAC) layer of the second layer provides a service to a radio link control (RLC) layer above the MAC layer via a logical channel.
  • the RLC layer of the second layer supports reliable data transmission.
  • the RLC layer may be implemented as a functional block inside the MAC layer.
  • PDCP packet data convergence protocol
  • a radio resource control (RRC) layer located on the lowest part of the third layer is defined in the control plane only.
  • the RRC layer is associated with configuration, re-configuration and release of radio bearers (RBs) to be in charge of controlling the logical, transport and physical channels.
  • the RB means a service provided by the second layer for the data transfer between the user equipment and the network.
  • the RRC layers of the user equipment and the network exchange RRC message with each other. If the RRC layer of the user equipment is RRC connected with the RRC layer of the network, the user equipment is in an RRC connected mode. If not so, the user equipment is in an RRC idle mode.
  • a non-access stratum (NAS) layer located above the RRC layer performs functions such as session management and mobility management.
  • NAS non-access stratum
  • One cell constituting a base station eNB is set to one of bandwidths of 1.4, 3.5, 5, 10, 15, and 20MHz and provides a downlink or uplink transmission service to several user equipments. At this time, different cells may be set to provide different bandwidths.
  • a broadcast channel carrying system information
  • a paging channel carrying paging message
  • a downlink shared channel carrying user traffic or control messages.
  • Traffic or control messages of a downlink multicast or broadcast service may be transmitted via the downlink SCH or an additional downlink multicast channel (MCH).
  • a random access channel carrying an initial control message and an uplink shared channel (UL-SCH) carrying user traffic or control message.
  • BCCH broadcast control channel
  • PCCH paging control channel
  • CCCH common control channel
  • MCCH multicast control channel
  • MTCH multicast traffic channel
  • FIG. 3 is a diagram illustrating physical channels used in a 3GPP LTE system and a general method for transmitting a signal using the physical channels.
  • the user equipment performs initial cell search such as synchronizing with the base station when it newly enters a cell or the power is turned on at step S301.
  • the user equipment synchronizes with the base station by receiving a primary synchronization channel (P-SCH) and a secondary synchronization channel (S-SCH) from the base station, and acquires information such as cell ID, etc.
  • P-SCH primary synchronization channel
  • S-SCH secondary synchronization channel
  • the user equipment may acquire broadcast information within the cell by receiving a physical broadcast channel (PBCH) from the base station.
  • PBCH physical broadcast channel
  • the user equipment may identify a downlink channel status by receiving a downlink reference signal (DL RS) at the initial cell search step.
  • DL RS downlink reference signal
  • the user equipment which has finished the initial cell search may acquire more detailed system information by receiving a physical downlink shared channel (PDSCH) in accordance with a physical downlink control channel (PDCCH) and information carried in the PDCCH at step S302.
  • PDSCH physical downlink shared channel
  • PDCCH physical downlink control channel
  • the user equipment may perform a random access procedure (RACH) such as steps S303 to S306 to complete access to the base station.
  • RACH random access procedure
  • the user equipment may transmit a preamble through a physical random access channel (PRACH) (S303), and may receive a response message to the preamble through the PDCCH and the PDSCH corresponding to the PDCCH (S304).
  • PRACH physical random access channel
  • the user equipment may perform a contention resolution procedure such as transmission (S305) of additional physical random access channel and reception (S306) of the physical downlink control channel and the physical downlink shared channel corresponding to the physical downlink control channel.
  • the user equipment which has performed the aforementioned steps may receive the physical downlink control channel (PDCCH)/physical downlink shared channel (PDSCH) (S307) and transmit a physical uplink shared channel (PUSCH) and a physical uplink control channel (PUCCH) (S308), as a general procedure of transmitting uplink/downlink signals.
  • Control information transmitted from the user equipment to the base station will be referred to as uplink control information (UCI).
  • the UCI includes HARQ ACK/NACK (Hybrid Automatic Repeat and request Acknowledgement/Negative-ACK), SR (Scheduling Request), CSI (Channel State Information), etc.
  • the HARQ ACK/NACK will be referred to as HARQ-ACK or ACK/NACK (A/N).
  • the HARQ-ACK includes at least one of positive ACK (simply, referred to as ACK), negative ACK (NACK), DTX and NACK/DTX.
  • the CSI includes CQI (Channel Quality Indicator), PMI (Precoding Matrix Indicator), RI (Rank Indication), etc.
  • the UCI is generally transmitted through the PUCCH, it may be transmitted through the PUSCH if control information and traffic data should be transmitted at the same time. Also, the user equipment may non-periodically transmit the UCI through the PUSCH in accordance with request/command of the network.
  • FIG. 4 illustrates a structure of a radio frame used in LTE.
  • transmission of an uplink/downlink data packet is performed on a subframe by subframe basis and one subframe is defined as a specific period including a plurality of OFDM symbols.
  • 3GPP LTE standards support a type-1 radio frame structure applicable to FDD (Frequency Division Duplex) and a type-2 radio frame structure applicable to TDD (Time Division Duplex).
  • FIG. 4(a) illustrates the type-1 radio frame structure.
  • a downlink radio frame includes 10 subframes, each of which includes two slots in the time domain.
  • a time taken to transmit one subframe is called a TTI (transmission time interval).
  • one subframe may be 1 ms in length and one slot may be 0.5 ms in length.
  • One slot includes a plurality of OFDM symbols in the time domain and a plurality of resource blocks (RBs) in the frequency domain.
  • 3GPP LTE uses OFDMA on downlink and thus an OFDM symbol refers to one symbol period.
  • An OFDM symbol may also be referred to as an SC-FDMA symbol or a symbol period.
  • An RB as a resource allocation unit may include a plurality of consecutive subcarriers in one slot.
  • the number of OFDM symbols included in one slot may depend on a CP (Cyclic Prefix) configuration.
  • the CP includes an extended CP and a normal CP.
  • the number of OFDM symbols included in one slot may be 7.
  • the length of one OFDM symbol increases and thus the number of OFDM symbols included in one slot is less than that in the case of the normal CP.
  • the number of OFDM symbols included in one slot can be 6.
  • the extended CP can be used to reduce inter-symbol interference.
  • one slot When the normal CP is used, one slot includes 7 OFDM symbols and thus one subframe includes 14 OFDM symbols.
  • a maximum of three OFDM symbols located in a front portion of each subframe may be allocated to a PDCCH (Physical Downlink Control Channel) and the remaining symbols may be allocated to a PDSCH (Physical Downlink Shared Channel).
  • PDCCH Physical Downlink Control Channel
  • PDSCH Physical Downlink Shared Channel
  • FIG. 4(b) illustrates the type-2 radio frame structure.
  • the type-2 radio frame includes two half frames. Each half frame is composed of four normal subframes each of which includes two slots and a special subframe including two slots, a DwPTS (Downlink Pilot Time Slot), a GP (Guard Period) and a UpPTS (Uplink Pilot Time Slot).
  • DwPTS Downlink Pilot Time Slot
  • GP Guard Period
  • UpPTS Uplink Pilot Time Slot
  • the DwPTS is used for initial cell search, synchronization or channel estimation in a UE.
  • the UpPTS is used for channel estimation and uplink transmission synchronization of a UE in a BS. That is, the DwPTS is used for downlink transmission and the UpPTS is used for uplink transmission. Particularly, the UpPTS is used for transmission of a PRACH preamble or SRS.
  • the GP is used to eliminate interference generated on uplink due to multipath delay of a downlink signal between uplink and downlink.
  • Table 1 shows DwPTS and UpPTS when T
  • the type-2 radio frame structure that is, an uplink/downlink (UL/DL) configuration in a TDD system is shown in Table 2.
  • Table 2 Uplink-downlink configuration
  • Subframe number 0 1 2 3 4 5 6 7 8 9 0 5 ms D S U U U D S U U U 1 5 ms D S U U D D S U U D 2 5 ms D S U D D D S U D D 3 10 ms D S U U U D D D D D D 4 10 ms D S U U D D D D D D 5 10 ms D S U D D D D D D D D 6 5 ms D S U U U U D S U U U D S U U D
  • D indicates a downlink subframe
  • U indicates an uplink subframe
  • S represents the special subframe.
  • Table 2 shows downlink-to-uplink switching periodicity in a UL/DL subframe configuration in each system.
  • the aforementioned radio frame structure is merely an example and the number of subframes included in a radio frame, the number of slots included in a subframe and the number of symbols included in a slot may be varied.
  • FIG. 5 illustrates a resource grid with respect to a downlink slot.
  • the downlink slot includes N symb DL OFDM symbols in the time domain. Since each RB includes N sc RB subcarriers, the downlink slot includes N RB DL ⁇ N sc RB subcarriers in the frequency domain. While FIG. 5 shows that the downlink slot includes 7 OFDM symbols and the RB includes 12 subcarriers, the number of OFDM symbols and the number of subcarriers are not limited thereto. For example, the number of OFDM symbols included in the downlink slot may be varied according to CP (Cyclic Prefix) length.
  • CP Cyclic Prefix
  • Each element on the resource grid is referred to as an RE (Resource Element) and one RE is indicated by one OFDM symbol index and one subcarrier index.
  • One RB is composed of N symb DL ⁇ N sc RB REs.
  • the number of RBs, N RB DL , included in the downlink slot depends on a downlink transmission bandwidth set in the corresponding cell.
  • FIG. 6 illustrates a downlink subframe structure
  • up to three (or four) OFDM symbols at the start of the first slot in a downlink subframe are used for a control region to which control channels are allocated and the other OFDM symbols of the downlink subframe are used for a data region to which a PDSCH is allocated.
  • Downlink control channels used in LTE include a physical control format indicator channel (PCFICH), a physical downlink control channel (PDCCH), and a physical hybrid automatic repeat request (ARQ) indicator channel (PHICH).
  • the PCFICH is located in the first OFDM symbol of a subframe, carrying information about the number of OFDM symbols used for transmission of control channels in the subframe.
  • the PHICH delivers a HARQ acknowledgment/negative acknowledgment (ACK/NACK) signal in response to uplink transmission.
  • ACK/NACK HARQ acknowledgment/negative acknowledgment
  • the DCI includes uplink resource allocation information and other control information for a UE or a UE group.
  • the DCI includes downlink/uplink scheduling information, an uplink transmit (Tx) power control command, etc.
  • the PDCCH carries transmission format and resource allocation information of a downlink shared channel (DL-SCH), transmission format and resource allocation information of an uplink shared channel (UL-SCH), paging information on a paging channel (PCH), system information on the DL-SCH, resource allocation information of an upper layer control message such as a random access response transmitted on the PDSCH, a set of Tx power control commands for individual UEs in a UE group, a Tx power control command, activity indication information of voice over Internet protocol (VoIP), and the like.
  • a plurality of PDCCHs can be transmitted in the control region.
  • the UE is able to monitor a plurality of PDCCHs.
  • the PDCCH is transmitted on an aggregation of one or a plurality of consecutive control channel elements (CCEs).
  • the CCE is a logic allocation unit used to provide the PDCCH with a coding rate based on a radio channel state.
  • the CCE corresponds to a plurality of resource element groups (REGs).
  • the format of the PDCCH and the number of bits of the PDCCH are determined according to the number of CCEs.
  • An eNB determines the PDCCH format according to the DCI to be transmitted to a UE and attaches cyclic redundancy check (CRC) to the control information.
  • CRC cyclic redundancy check
  • the CRC is masked with an identifier (e.g., radio network temporary identifier (RNTI)) depending on usage of the PDCCH or an owner of the PDCCH. For instance, if the PDCCH is for a specific UE, the CRC may be masked with an identifier (e.g., cell-RNTI (C-RNTI)) of the corresponding UE. If the PDCCH is for a paging message, the CRC may be masked with a paging identifier (e.g., paging-RNTI (P-RNTI)).
  • RNTI radio network temporary identifier
  • the CRC may be masked with a system information RNTI (SI-RNTI). If the PDCCH is for a random access response, the CRC may be masked with a random access RNTI (RA-RNTI).
  • SI-RNTI system information RNTI
  • RA-RNTI random access RNTI
  • FIG. 7 illustrates a structure of an uplink subframe used in LTE.
  • an uplink subframe includes a plurality (e.g., 2) of slots.
  • the number of SC-FDMA symbols included in the slot may vary depending on the CP length.
  • the uplink subframe is divided into a control region and a data region in the frequency domain.
  • the data region includes a PUSCH and is used to transmit a data signal such as voice.
  • the control region includes a PUCCH and is used to transmit uplink control information (UCI).
  • the PUCCH includes an RB pair located at both ends of the data region on a frequency axis and is hopped at a slot boundary.
  • the PUCCH can be used to transmit the following control information.
  • the amount of UCI that can be transmitted in a subframe by a UE depends on the number of SC-FDMA symbols available for control information transmission.
  • the SC-FDMA symbols available for control information transmission mean the remaining SC-FDMA symbols except SC-FDMA symbols for reference signal transmission in a subframe.
  • a last SC-FDMA symbol of the subframe is also excluded.
  • the reference signal is used for coherent detection of the PUCCH.
  • D2D device-to-device
  • D2D communication can be divided into communication assisted by a network/coordination station (e.g., BS) and communication that is not assisted.
  • BS network/coordination station
  • FIG. 8 is a reference diagram illustrating D2D communication.
  • FIG. 8(a) illustrates a scheme in which a network/coordination station intervenes in transmission and reception of a control signal (e.g., grant message), HARQ, channel state information and the like and only data is transmitted and received between UEs that perform D2D communication.
  • FIG. 8(b) illustrates a scheme in which a network provides only minimum information (e.g., D2D connection information that can be used in the corresponding cell) and UEs performing D2D communication establish links and transmit and receive data.
  • a control signal e.g., grant message
  • HARQ channel state information
  • FIG. 8(b) illustrates a scheme in which a network provides only minimum information (e.g., D2D connection information that can be used in the corresponding cell) and UEs performing D2D communication establish links and transmit and receive data.
  • D2D synchronization signal (transmission/reception) resources and D2DSS transmission conditions in an environment in which D2D communication is performed according to the present invention
  • D2D communication refers to direct communication between UEs using a radio channel.
  • a UE generally refers to a user terminal and may be regarded as a UE to which the present invention is applicable when network equipment such as an eNB transmits/receives signals according to communication scheme between UEs.
  • WAN DL communication may refer to communication through which an eNB transmits an (E)PDCCH, a PDSCH, a CRS, a CSI-RS and the like to a UE and WAN communication may refer to communication through which a UE transmits a PRACH, a PUSCH, a PUCCH and the like to an eNB.
  • D2D TX UE a UE that transmits D2D signals
  • D2D RX UE a UE that receives D2D signals
  • embodiments of the present invention may be extended and applied to i) a case in which some D2D UEs joining in D2D communication are within network coverage and the remaining D2D UEs are outside network coverage (D2D discovery/communication of partial network coverage), ii) a case in which all D2D UEs joining in D2D communication are within network coverage (D2D discovery/communication within network coverage) and/or iii) a case in which all D2D UEs joining D2D communication are outside network coverage (D2D discovery/communication outside network coverage (for public safety only)).
  • a resource unit (RU) corresponding to a specific resource is selected within a resource pool that refers to a set of contiguous resources and a D2D signal is transmitted using the RU (i.e., operation of a D2D TX UE).
  • Information on a resource pool in which the D2D TX UE can transmit a signal is signaled to a D2D RX UE and the D2D RX UE detects a signal of the D2D TX UE.
  • the resource pool information may be i) signaled by an eNB when the D2D TX UE is within the coverage of the eNB and ii) signaled by another UE or determined as predetermined resources when the D2D TX UE is outside the coverage of the eNB.
  • a resource pool is composed of a plurality of RUs and each UE may select one or more RUs and use them to transmit D2D signals thereof.
  • FIG. 9 is a reference diagram illustrating an example of a configuration of RUs for D2D communication.
  • the diagram shows that all frequency resources are divided into NF resources and all time resources are divided into NT resources to define a total of NF*NT RUs.
  • the corresponding resource pool is repeated at an interval of NT subframes.
  • one RU may periodically appear as illustrated in FIG. 9 .
  • the index of a physical RU to which a logical RU is mapped may be varied with time in a predetermined pattern in order to obtain diversity effect in the time or frequency domain.
  • a resource pool may refer to a set of RUs that can be used for a UE to transmit D2D signals.
  • the aforementioned resource pool may be subdivided.
  • the resource pool can be classified according to D2D signal content transmitted in the resource pool.
  • D2D signal content can be classified as follows and a resource pool may be configured per D2D signal content.
  • different resource pools may be used depending on D2D signal transmission/reception properties.
  • a D2D signal transmission timing determination method e.g., a method of transmitting a D2D signal at synchronization reference signal reception timing or a method of applying a specific TA (Timing Advance) and transmitting a D2D signal at synchronization reference signal reception timing
  • a resource allocation method e.g., a method through which a cell designates transmission resources for an individual signal to an individual D2D TX UE or a method through which an individual D2D TX UE selects individual signal transmission resources within a pool or iii
  • a signal format e.g., the number of symbols occupied by each D2D signal in one subframe or the number of subframes used to transmit one D2D signal.
  • a resource allocation method for D2D data channel transmission may be divided into the following two modes.
  • a resource allocation method for discovery message transmission may be divided into the following two types.
  • FIG. 10 illustrates a case in which a discovery message related resource pool (referred to hereinafter as “discovery resource pool”) periodically appears.
  • a period in which the resource pool appears is referred to as a "discovery resource pool period”.
  • specific discovery resource pools from among a plurality of discovery resource pools configured in (one) discovery resource pool period may be defined as serving cell related discovery transmission/reception resource pools and other (remaining) discovery resource pools may be defined as neighbor cell related discovery reception resource pools.
  • a D2DSS resource configuration method and D2DSS transmission conditions proposed by the present invention will be described on the basis of the above description.
  • the out-of-coverage UE cannot transmit a D2DSS in two or more D2DSS resources.
  • two D2DSS resources are used for out-of-coverage, for example.
  • D2DSS resource positions may be previously set or signaled (with respect to DFN #0 (or on the basis of DFN #0)), for example.
  • a D2D RX UE when a D2D RX UE receives neighbor cell related synchronization error information of w1 / w2 (through predefined higher layer signaling), the D2D RX UE assumes a discovery reference synchronization window having a size of ⁇ w1 / ⁇ w2 for a neighbor cell D2D resource (and/or a neighbor cell discovery resource pool) (refer to Table 3).
  • UE may assume for the purpose of discovery a reference synchronization window of size +/- w1 ms for that neighbor cell with respect to neighbor cell D2DSS resource w1 is a fixed value and decided UE may assume D2DSS is transmitted in that cell • If higher layer indicates w2 in a given neighbor cell, UE may assume for the purpose of discovery a reference synchronization window of size +/- w2 ms for that neighbor cell with respect to neighbor cell discovery resource Exact value of w2 is decided RAN1 recommend w2 as not greater than CP length (of the order of CP length) • UE expects that D2DSS indicated by the resource pool configuration appears only within signaled reference synchronization window
  • FIG. 11 is a reference diagram illustrating D2DSS SF configuration and D2DSS relay SF for the aforementioned in-coverage UE and out-of-coverage UE.
  • a maximum of one D2DSS resource may be configured per cell for an in-coverage UE (e.g., UE A ) present within the coverage of an eNB.
  • D2DSS resource e.g., D2DSS relay SF
  • D2DSS relay may be configured along with (one) D2DSS resource aligned with the D2DSS resource for the in-coverage UE.
  • FIG. 12 illustrates positions of discovery pools in which a D2DSS is transmitted.
  • the D2DSS can be transmitted in the first subframe of a discovery pool (a) or a subframe corresponding to the closest D2DSS resource prior to discovery pool start time (b).
  • D2DSS transmission conditions may be different for the in-coverage UE and the out-of-coverage UE.
  • D2DSS transmission can be instructed by the eNB through dedicated signaling or ii) D2DSS transmission can be determined according to (previously set or designated) RSRP standards in the case of the in-coverage UE.
  • D2DSS transmission can be determined on the basis of (energy) measurement/detection with respect to a PSBCH (Physical Sidelink Broadcast Channel) DMRS.
  • PSBCH Physical Sidelink Broadcast Channel
  • a signal e.g., a PSBCH DMRS
  • a predetermined threshold value is not measured/detected (within a predetermined area/distance)
  • the UE performs D2DSS transmission (as an independent synchronization source (ISS)) upon determining that there is no synchronization source (within the predetermined area/distance).
  • D2D communication e.g., SA and D2D data
  • pool related D2DSS transmission.
  • D2DSS transmission can be an optional characteristic of D2D capable UEs. Accordingly, it is desirable that only D2DSS capable UEs transmit a D2DSS, for example.
  • a discovery UE transmits a D2DSS in a single subframe in each discovery period.
  • This operation can be performed according to discovery only for in-NW UEs. That is, an in-NW UE is synchronized with a cell and thus frequency error between a TX UE and an RX UE is limited and D2DSS detection in a single subframe is sufficiently reliable. In this case, additional conditions for D2DSS scanning are not necessary because the serving cell provides D2DSS resources of neighbor cells and D2DSS resources of a plurality of cells can be separated in the time domain according to network configuration. Furthermore, a UE may not transmit a discovery signal in a resource pool because of collision with WAN UL TX.
  • the UE transmits a discovery message in the discovery pool
  • the UE intends to transmit a discovery message in the discovery pool
  • whether a D2DSS needs to be transmitted prior to SA transmission may be considered with respect to communication. (Here, data cannot be transmitted prior to SA transmission.) This is because D2DSS resources may not be present before an SA subframe within the SA/data period. In this case, SA can be transmitted first and then the D2DSS can be transmitted. That is, conditions similar to the aforementioned discovery (related D2DSS transmission) conditions may be additionally set if synchronization is needed prior to SA reception.
  • D2DSS transmission in a single subframe may not provide reliable synchronization capability to out-NW UEs that may have a large initialization frequency offset. Accordingly, it is desirable that the D2DSS be transmitted in a plurality of subframes prior to SA transmission.
  • time limitation may be needed for preceding D2DSS transmission because it is difficult for a UE to correctly predict intention of SA transmission when there is a large time gap between a D2DSS subframe and an SA subframe.
  • in-NW UEs need to continuously transmit the D2DSS for at least a predetermined interval. Accordingly, the out-NW UEs can detect the D2DSS at least once in a set of continuous D2DSS transmission subframes.
  • out-NW UEs it is necessary for out-NW UEs to select synchronization reference, to perform D2DSS measurement for determination of whether D2DSS transmission conditions are satisfied and to average D2DSS subframes through appropriate (or reliable) measurement, and thus it is desirable to avoid random on-off of D2DSS transmission at intervals of 40 ms.
  • a UE may be configured to transmit the D2DSS even when the UE does not transmit SA or D2D data in the SA/data period if a predetermined specific condition is satisfied. This is called “condition for continuing D2DSS transmission" hereinafter.
  • the "condition for continuing D2DSS transmission" can be based on the principle that a UE continuously (or consecutively) performs D2DSS transmission for a (previously set) time period if the UE has transmitted the D2DSS. This principle can guarantee continuous D2DSS transmission that helps D2DSS detection and measurement of out-NW UEs.
  • FIG. 13 is a reference diagram illustrating options 1-1 to 1-3. A description will be given with reference to FIG. 13 .
  • the UE needs to clarify transmission of no D2DSS in subframes that do not satisfy D2DSS transmission conditions.
  • the eNB may recognize at least a subset of subframes in which the D2DSS is not transmitted and use D2DSS resources in such subframes for cellular (communication) transmission.
  • a reference synchronization window for discovery may be applied to communication for D2DSS reception because discovery and communication share the same D2DSS resource.
  • the UE can detect a correct position of D2DSS transmission for discovery after reception of a discovery resource pool. Further, since the D2DSS may be omitted or transmitted outside the synchronization window in the case of w2, D2DSS (reception) related UE supposition within the synchronization window may be limited to the case of w1.
  • the reference synchronization window can be applied to both discovery and communication on the basis of the principle that "a UE expects that D2DSS indicated by the resource pool configuration appears only within a signaled reference synchronization window if w1 is indicated.”
  • out-NW UEs will be described. For example, it is important to minimize the number of D2DSSs that need to be tracked by an out-NW UE. That is, the UE can track only a limited number of D2DSSs and thus cannot receive all incoming SA and data when the number of D2DSSs related to incoming SA and data exceeds the limited number.
  • a D2DSS sequence selection process for out-NW UEs is determined by the following three steps.
  • a "set of D2DSS sequence(s) transmitted by a UE when the transmission timing reference is an eNB" is referred to as D2DSS_net and a "set of D2DSS sequence(s) transmitted by a UE when the transmission timing reference is not an eNB” is referred to as D2DSSue_oon, for example, for convenience of description.
  • the ISS can maintain ISS operation only when a D2DSS other than the D2DSS transmitted by the ISS is not detected during the reselection process before the reselection process is performed.
  • the out-NW UE can determine a D2DSS sequence to be used for D2DSS transmission.
  • the present invention specifically defines "detecting D2DSS" because it is not appropriate that a D2DSS is considered to be detected and a UE is used as a reliable synchronization source when an associated PD2DSCH is not correctly decoded or PD2DSCH reception quality is considerably low.
  • associated PD2DSCH reception quality e.g., RSRQ of a PD2DSCH DMRS
  • a UE can assume that the D2DSS is not detected (and thus the D2DSS does not affect the D2D synchronization process of the UE).
  • the following settings can be applied for D2DSS sequence selection.
  • D2DSS transmission condition formulations for in-NW UEs can be reused.
  • a UE that is not an ISS transmits a D2DSS irrespective of whether SA/data thereof is transmitted when D2DSSs from other UEs are detected. That is, additional conditions for D2DSS transmission of a non-ISS UE may be needed.
  • an RSRP threshold value can be replaced by a D2DSS measurement threshold value and eNB configuration parts may be removed.
  • D2DSS transmission may need to be performed prior to SA transmission and D2DSS transmission maintaining conditions may be necessary.
  • conditions for determining whether a D2DSS will be transmitted in one subframe by an out-NW UE can be set as follows.
  • D2D TX resources only two D2DSS resources are configured as D2D TX resources, and out-NW UEs receive a D2DSS from their synchronization references in one D2DSS resource and transmit a D2DSS in the remaining D2DSS resource.
  • a periodically appearing synchronization resource is used for D2DSS transmission.
  • a PD2DSCH (if supported) may be transmitted during D2DSS transmission, for example.
  • the size of the synchronization resource may be predefined and the period of the synchronization resource may be preset.
  • a D2D synchronization source transmits a D2DSS in synchronization resources
  • the D2D synchronization source transmits the D2DSS in at least one synchronization resource and receives the D2DSS in at least other synchronization resources.
  • synchronization resources used to transmit and/or receive the D2DSS may be preset.
  • a timing offset may be set between a synchronization resource for D2DSS reception and a synchronization resource for D2DSS transmission.
  • a UE must not transmit any (other) D2D signals/channels in a (D2DSS) subframe that is not used for D2DSS transmission thereof in order to clarify D2DSS reception from other UEs.
  • D2DSS D2DSS
  • D2D-silent period is necessary when a UE performs the D2DSS reselection process. Even when a synchronization resource periodically appears and the UE does not transmit any (other) D2D signals/channels in (other) synchronization resources other than synchronization resources used for D2DSs transmission thereof, D2DSS transmission from eNBs and UEs which are not synchronized with the periodic synchronization resource may be performed (in synchronization resources that are not used for D2DSS transmission of the UE).
  • D2D-silent period for D2D scanning that is not obstructed (or interfered with) by transmission of neighbor D2D UEs. If this period is not defined, an out-NW UE may not detect a D2DSS that is transmitted from an eNB or an in-NW UE and is weak but has high priority due to interference from other out-NW UEs.
  • the present invention can define the "D2D-slient period" as a multiple of a D2DSS period to support scanning of other synchronization sources by out-NW UEs.
  • the above-described proposed methods may be restrictively applied to mode-2 communication and/or type-1 discovery (and/or mode-1 communication and/or type-2 discovery).
  • the above-described proposed methods may be restrictively applied only when a D2D RX UE receives neighbor cell related synchronization error information of inter-cell discovery signal (and/or neighbor cell discovery signal) reception related W1.
  • the above-described proposed methods may be restrictively applied to at least one of an in-coverage D2D UE, an out-coverage D2D UE and an RRC_connected D2D UE and an RRC_idle D2D UE.
  • the above-described proposed methods may be restrictively applied to a D2D UE performing only D2D discovery (transmission/reception) operation (and/or a D2D UE performing only D2D communication (transmission(/reception)).
  • the above-described proposed methods may be restrictively applied to a scenario in which only D2D discovery is capable/set (and/or a scenario in which only D2D communication is capable/set).
  • CA carrier aggregation
  • the above-described proposed methods may be restrictively applied to a case in which D2D discovery signal reception in other (UL) carriers at an inter-frequency is performed and/or a case in which D2D discovery signal reception in other PLMN (UL) carriers based on inter-PLMN is performed.
  • FIG. 14 illustrates a base station (BS) and a UE applicable to an embodiment of the present invention.
  • a wireless communication system includes a relay
  • communication is performed between a BS and the relay on a backhaul link and communication is performed between the relay and a UE on an access link.
  • the BS or UE shown in the figure may be replaced by the relay as necessary.
  • a wireless communication system includes a BS 110 and a UE 120.
  • the BS 110 includes a processor 112, a memory 114 and a radio frequency (RF) unit 116.
  • the processor 112 may be configured to implement the procedures and/or methods proposed by the present invention.
  • the memory 114 is connected to the processor 112 and stores various types of information related to operations of the processor 112.
  • the RF unit 116 is connected to the processor 112 and transmits and/or receives radio signals.
  • the UE 120 includes a processor 122, a memory 124 and a radio frequency (RF) unit 126.
  • the processor 122 may be configured to implement the procedures and/or methods proposed by the present invention.
  • the memory 124 is connected to the processor 122 and stores various types of information related to operations of the processor 122.
  • the RF unit 126 is connected to the processor 122 and transmits and/or receives radio signals.
  • the BS 110 and/or the UE 120 may include a single antenna or multiple antennas.
  • a specific operation described as performed by the BS may be performed by an upper node of the BS. Namely, it is apparent that, in a network comprised of a plurality of network nodes including a BS, various operations performed for communication with a UE may be performed by the BS, or network nodes other than the BS.
  • the term BS may be replaced with the term, fixed station, Node B, eNode B (eNB), access point, etc.
  • the embodiments of the present invention may be achieved by various means, for example, hardware, firmware, software, or a combination thereof.
  • the methods according to the embodiments of the present invention may be achieved by one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, etc.
  • ASICs Application Specific Integrated Circuits
  • DSPs Digital Signal Processors
  • DSPDs Digital Signal Processing Devices
  • PLDs Programmable Logic Devices
  • FPGAs Field Programmable Gate Arrays
  • processors controllers, microcontrollers, microprocessors, etc.
  • the embodiments of the present invention may be implemented in the form of a module, a procedure, a function, etc.
  • software code may be stored in a memory unit and executed by a processor.
  • the memory unit may be located at the interior or exterior of the processor and may transmit data to and receive data from the processor via various known means.

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US201462066890P 2014-10-21 2014-10-21
US201462076468P 2014-11-06 2014-11-06
US201462077888P 2014-11-10 2014-11-10
US201462080253P 2014-11-14 2014-11-14
US201462086175P 2014-12-01 2014-12-01
US201562146177P 2015-04-10 2015-04-10
US201562150869P 2015-04-22 2015-04-22
US201562154738P 2015-04-30 2015-04-30
US201562161853P 2015-05-14 2015-05-14
PCT/KR2015/011158 WO2016064195A2 (ko) 2014-10-21 2015-10-21 무선 통신 시스템에서 d2d 신호 송수신 방법 및 이를 위한 장치

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CN107079276B (zh) 2021-06-22
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JP2020191666A (ja) 2020-11-26
EP3211942A1 (de) 2017-08-30
EP3211944A4 (de) 2018-06-13
US10873843B2 (en) 2020-12-22
JP2017538322A (ja) 2017-12-21
CN107079276A (zh) 2017-08-18
EP3211942B1 (de) 2023-03-29
KR102426407B1 (ko) 2022-07-28
US20170303222A1 (en) 2017-10-19
WO2016064195A2 (ko) 2016-04-28
WO2016064193A1 (ko) 2016-04-28
JP2017537511A (ja) 2017-12-14
US10834558B2 (en) 2020-11-10
EP3211944B1 (de) 2023-03-29
JP7225169B2 (ja) 2023-02-20
JP2017531964A (ja) 2017-10-26
WO2016064195A3 (ko) 2016-06-09
EP3211816A4 (de) 2018-07-18
EP3211816B1 (de) 2023-01-04
WO2016064196A1 (ko) 2016-04-28
KR20170080610A (ko) 2017-07-10
CN107079247A (zh) 2017-08-18
EP3211816A1 (de) 2017-08-30
US20170339511A1 (en) 2017-11-23
JP6549226B2 (ja) 2019-07-24
US20170339679A1 (en) 2017-11-23
US20210235247A1 (en) 2021-07-29

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